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Dependence of kink oscillation damping on the amplitude
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Goddard, Christopher R. and Nakariakov, V. M. (Valery M.) (2016) Dependence of kink oscillation damping on the amplitude. Astronomy & Astrophysics, 590 . L5. doi:10.1051/0004-6361/201628718 ISSN 0004-6361.
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Official URL: https://doi.org/10.1051/0004-6361/201628718
Abstract
Context. Kink oscillations of coronal loop are one of the most ntensively studied oscillatory phenomena in the solar corona. In the large-amplitude rapidly damped regime these oscillations are observed to have a low quality-factor, with only a few cycles of oscillation detected before they are damped. The specific mechanism responsible for the rapid damping is commonly accepted to be associated with the linear coupling between collective kink oscillations and localised torsional oscillations, the phenomenon of resonant absorption of the kink mode. However, the role of finite amplitude effects is still not clear.
Aims. We investigated the empirical dependence of the kink oscillation damping time and its quality factor, defined as the ratio of the
damping time to the oscillation period, on the oscillation amplitude.
Methods. We analysed decaying kink oscillation events detected previously with TRACE, SDO/AIA and and STEREO/EUVI in the EUV 171Å band.
Results. We found that the ratio of the kink oscillation damping time to the oscillation period systematically decreases with the oscillation amplitude. The quality factor dependence on the oscillation isplacement amplitude has been approximated by the powerlaw dependence with the exponent of −1/2, however we stress that this is a “by eye”estimate, and a more rigorous estimation of the scaling law requires more accurate measurements and increased statistics. We conclude that damping of kink oscillations of coronal loops depends on the oscillation amplitude, indicating the possible role of nonlinear mechanisms for damping.
Item Type: | Journal Article | ||||||||
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Subjects: | Q Science > QB Astronomy | ||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||
Library of Congress Subject Headings (LCSH): | Sun -- Corona, Solar oscillations | ||||||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||||||
Publisher: | EDP Sciences | ||||||||
ISSN: | 0004-6361 | ||||||||
Official Date: | June 2016 | ||||||||
Dates: |
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Volume: | 590 | ||||||||
Article Number: | L5 | ||||||||
DOI: | 10.1051/0004-6361/201628718 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||||
Date of first compliant deposit: | 10 May 2016 | ||||||||
Date of first compliant Open Access: | 10 May 2016 | ||||||||
Funder: | European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC) | ||||||||
Grant number: | 321141 (ERC), ST/L000733/1 (STFC) |
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